Now showing items 1-17 of 17

    • Desarrollo de un pulser / amplificador para transductores de ultrasonidos 

      Tremosa Hernández, Roger (Universitat Politècnica de Catalunya, 2020-06-29)
      Bachelor thesis
      Restricted access - confidentiality agreement
    • Design of a GUI based on the implemented IEEE1451 Standard in a Wireless Sensor Network 

      Ardanuy Comas, Xavier (Universitat Politècnica de Catalunya, 2014-07-24)
      Bachelor thesis
      Open Access
      Covenantee:   Technische Universität Berlin
      [ANGLÈS] Wireless Sensor Networks are widely used in different fields for monitoring and controling purposes. The family of standards IEEE1451 defines a set of communications interfaces between the sensors and the ...
    • Design project of a miniature load transducer. 

      Uriz Rosich, Victor (Universitat Politècnica de Catalunya, 2014-06-26)
      Bachelor thesis
      Restricted access - author's decision
      In this project the design of a compact load transducer is proposed in order to know the tensile load of wires under their operational conditions. This transducer will consist basically of two components, an elastic ...
    • Estudi i caracterització de la resposta elèctrica d’elements piezoelèctrics davant diferents excitacions 

      Ortega Olivares, Jordi (Universitat Politècnica de Catalunya, 2017-06)
      Bachelor thesis
      Open Access
      L’objectiu d’aquest estudi és determinar les condicions òptimes de les tensions mecàniques, vibracions, a les que estaran sotmesos els transductors piezoelèctrics del tipus PI-876.A12 per aconseguir la màxima resposta ...
    • Evaluation of trr distorting effects reduction in DCI-NPC multilevel power amplifiers by using SiC diodes and MOSFET technologies 

      Sala Caselles, Vicenç; Resano, Tomas; Romeral Martínez, José Luis; Moreno Eguilaz, Juan Manuel (Curran, 2013)
      Conference report
      Restricted access - publisher's policy
      In the last decade, the Power Amplifier applications have used multilevel diode-clamped-inverter or neutral-point-clamped (DCI-NPC) topologies to present very low distortion at high power. In these applications a lot of ...
    • Implementación de un transponder 64QAM en FPGA mediante Simulink 

      Alonso Varela, Marc (Universitat Politècnica de Catalunya, 2016-09)
      Bachelor thesis
      Open Access
      The current evolution of communication systems has been driven by the high demand of resources that are needed to satisfy services which are dependent of the network. To contain the high requirements of current and emerging ...
    • Method to measure reflection coefficient under CW high-power signals in SAW resonators 

      González Rodríguez, Marta; Collado Gómez, Juan Carlos; Mateu Mateu, Jordi; González Arbesú, José María; Huebner, Sebatian; Aigner, Robert (Institute of Electrical and Electronics Engineers (IEEE), 2021)
      Conference report
      Restricted access - publisher's policy
      Improving power handling and lifetime are key assets to ensure device performance and reliability. SAW resonators composed by very thin cross-section inter-digital transducer (IDT) structures make difficult to control the ...
    • New strategy to minimize dead-time distortion in DCI-NPC power amplifiers using COE-error injection 

      Resano, Tomas; Sala Caselles, Vicenç; Romeral Martínez, José Luis; Moreno Eguilaz, Juan Manuel (Curran, 2013)
      Conference report
      Restricted access - publisher's policy
      The DCI-NPC topology has become one of the best options to optimize energy efficiency in the world of high power and high quality amplifiers. This can use an analog PWM modulator that is sensitive to generate distortion ...
    • Nueva plataforma dinamométrica para el análisis y valoración del rendimiento deportivo 

      Sánchez Lacuesta, J.; Comín, M.; Prat, J.; Soler, C.; Dejoz, R.; Peris, J. L.; Hoyos, J.V.; Vera, P. (Sociedad Ibérica de Biomecánica y Biomateriales, 1993)
      Article
      Open Access
      Un nuevo modelo de plataforma dinamométrica ha sido desarrollado por el Instituto de Biomecánica de Valencia (IBV) y se han fabricado sus primeros prototipos. Permite la medida de la fuerza de reaccipón tridimensional, en ...
    • Projecte de disseny mecànic per a una bàscula de precisió per al pesat i centrat de planadors 

      Garcia Valero, Jordi (Universitat Politècnica de Catalunya, 2017-06-20)
      Master thesis
      Restricted access - author's decision
    • Sistema de localització per ultrasons 

      Reales Ferreres, Josep (Universitat Politècnica de Catalunya, 2016-10)
      Master thesis (pre-Bologna period)
      Restricted access - author's decision
      The project aims to develop an integral hardware-software system to detect the position of an object in the near zone using a low cost ultra-wave transducer. The project will use a development board from the same author.
    • Splitting of the ultrasounic beam path in clamp-on ultrasonic flowmeters due to propagation through dispersive materials 

      Millán Blasco, Oliver; Salazar Soler, Jorge; Chávez Domínguez, Juan Antonio; Turó Peroy, Antonio; García Hernández, Miguel J. (Institute of Electrical and Electronics Engineers (IEEE), 2017)
      Conference report
      Restricted access - publisher's policy
      This article explains how a multi-frequency ultrasonic beam path is split due to passing through dispersive materials and the implications that it has in flow measurement using a Clamp-on ultrasonic flowmeter. The importance ...
    • The HOM problem is EXPTIME-complete 

      Creus López, Carles; Gascon Caro, Adrian; Godoy Balil, Guillem; Ramos Garrido, Lander (2016)
      Article
      Open Access
      We define a new class of tree automata with constraints and prove decidability of the emptiness problem for this class in exponential time. As a consequence, we obtain several EXPTIME-completeness results for problems on ...
    • The IEEE1451 Std applied to data acquisition systems in the TJ-II nuclear fusion device 

      Río Fernandez, Joaquín del; Sánchez Florido, Alberto; Adil, Rachid; Artero Delgado, Carola; Masmitjà Rusiñol, Ivan; Toma, Daniel; Moreno Lupiáñez, Manuel; Ruiz, Mariano; Ochando, Marian; Molinero, Antonio; Vega, Jesús (2015)
      Conference report
      Open Access
    • The noise performance of a high-speed capacitive-sensor interface based on a relaxation oscillator and a fast counter 

      Gasulla Forner, Manuel; Li, Xiujun; Meijer, Gerard C. M. (Institute of Electrical and Electronics Engineers, 2005-10)
      Article
      Open Access
      This paper presents the analysis and experimental results on the noise performances of a capacitive-sensor interface. The interface is able to measure low capacitance values in the order of picofarads and is implemented ...
    • Ultrasonic pulse generation by a piezoelectric transducer at cryogenic temperatures 

      Granados Jiménez, Marta (Universitat Politècnica de Catalunya, 2018-06)
      Bachelor thesis
      Open Access
      The use of cryogenic liquid propellants such as liquid hydrogen or liquid oxygen has arisen a problem for future space missions. As a result of long storage periods bubbles are formed in propellant tanks due to boil-off. ...
    • Zero-flow offset variation in ultrasonic clamp-on flowmeters due to inhomogeneity and nonlinearity of pipe materials 

      Millán Blasco, Oliver; Salazar Soler, Jorge; Chávez Domínguez, Juan Antonio; Turó Peroy, Antonio; García Hernández, Miguel J. (2017-11)
      Article
      Restricted access - publisher's policy
      The objective of this paper is to measure the zero-flow offset variation in ultrasonic Clamp-on flowmeters produced by using pipes made of materials with a nonhomogeneous and nonlinear behavior. The evaluation of this ...